X40020S14-C

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PMIC - Supervisors are key components of electronic systems, responsible for protecting the system from power-related faults and providing critical monitoring and control functions. The X40020S14-C, a Supervisory Circuit from ON Semiconductor, is an AssetLiAble(TM) device that ensures voltage levels remain within safe thresholds; its application field includes detecting glitches, maintaining power integrity and providing system reset control during power-on and power-off sequences.

The X40020S14-C\'s primary function is to monitor two incoming voltages and reset an output pin if either voltage falls out of predetermined ranges. It is designed to monitor power supplies as well as other system signals and requires just a single resistor on the power-on reset (POR) and power-down reset (PDR) functions. This flexible feature set makes the X40020S14-C well-suited to a wide variety of applications, including automotive, industrial, computing, consumer, and communications systems.

The X40020S14-C\'s on-chip circuit diagram begins with a control signal input pair that determines the operating state of the device. When the voltage on these pins is between 0V and 0.8V, the device is in reset mode and the output pin is held low. When the voltage rises above 0.8V, the device is in operate mode and the output pin is released. The two voltage monitor inputs, VCC and VH, each have selectable upper and lower thresholds. These thresholds can be set in the range of 0.6V to 4V for the VCC input and 1V to 4V for the VH input.

Each voltage monitor input has an internal voltage divider connected to the lower threshold and an external resistor connected to the upper threshold. When the voltage level at a voltage monitor input is within the selectable thresholds, the device remains in operate mode. If the voltage level at the input falls above or below the selectable thresholds, the device switches to reset mode and the output pin is held low. This ensures that power-related faults can be handled in a safe and reliable manner.

The X40020S14-C also provides for control of power-on-reset (POR) and power-down-reset (PDR) functions. The POR signal is used to detect when power is applied to the device and triggers a reset signal that can be used to activate countermeasures such as waiting for an operating signal before powering up the system or entering a safe mode. The PDR signal is used to detect when power is removed from the device and triggers a separate reset signal that can be used to ensure clean shutdown procedures are followed.

In addition to these features, the X40020S14-C also features several other helpful safety features. It has an integrated protected supply voltage (VCC) to provide reliable power-up and power-down reset behavior and a maximum duty cycle of 25%, providing additional safeguards against power-related faults. Finally, the device includes diagnostic outputs that can be used to test its functionality and provides output state reporting to detect and validate power faults.

The X40020S14-C is an extremely reliable, versatile Supervisory Circuit that can protect electronic systems from power-related faults and provide critical monitoring and control functions. It is well-suited to applications in the automotive, industrial, computing, consumer, and communications fields and its advanced safety features make it an ideal solution for safety-critical environments.

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